Improvement in the manufacture of white lead



2 sheets-sheer 1.

THOMASA H. BURRIDGE.

Improvement inthe Manufacture of White-Lead. [10"]14405` Patented May 2,1871.

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2 Sheets--Sheet 2.

THOMAS HjBURRIDGE.

Improvement in the Manufacture of White-Lead.

No. 114,405 Patented May2,1871.

15g, J. 1go', i.

INININIW that@ iaiet THOMAS. BURRIDGE, 0F ST. LOUISyMI-SSOURI.

Letters Patent No. 114,405, dated May 2, 1871.

IMPROVEMENT IN T-HE MANUFACTURE OE WHITE LEAD.

The Schedule referred to in these Letters Patent and making part of the same.

To all lwhom 'it may concern:

Be it known that I, THOMAS H. BURmDen, of St. Louis, in the county'of St. Louis and State of Missouri, have invented a certain new and improved Lead- Machine; and Ido hereby declare that the following is a full, clear, and complete description of the same, reference being had to the accompanying drawing making part ot' this speciiication, in which- Figure l is a front elevation of the apparat-us.

'Figure 2 is a rear elevation.

Figures 3 and 4 are side elevations,

Figure 5 is a plan View Figure 6 is a vertical section. v

Figure 7 is a detached section.

Like letters of reference refer to like parts in the several views.

The nature of this invention `relates to an apparatus for the manufacture of white lead and other metallic pigments; `and The object of said invention is to produce carbonate of lead and other metallic pigments in a much shorter period ottime than is required in the ordinary process, andV of as good a quality, thereby reducing the cost of said pigments.

`A represents a chamber, which may be constructed of any material unaffected by the presence of acids used, and'which also may be of any desirable shape and of any capacity. I

vSaid chamber is divided into compartments, B, iig. 6, more or less in numb'enin which are fitted 'drawers, O, iig. l. A detached view,of one of said draw- -ers is shown in tig. 7, in which it will be'seen that the bottom thereof is perforated with holes a.

Instead of said drawers there may be a series of perforated shelves; practically, however, the drawers are found to be the .most convenient.

Immediately below said drawers is a vapor-cham# ber, E, tig. 6, which is put in communication with a gas-generator, F, by means of a pipe,.G.

In said generator is fitted a drawer, H, tig. 6, nnderneath which is a fire-place or furnace, I, Said generator is also constructed of any material not readly'afected by the action of acids engaged lfox-.this purpose.

K, iig. 4, is a force-pumporinjector, connected to the chamber E by a pipe, 1', the purpose of which, will hereinafter be shown.

The practical operation of the above-described apparatus is as follows, viz.;

Granulated lead or other metal of which the pigment is to be made (the product of the granulatingmachine L, shown at the lside of the apparatus, and. which is used in connecticut-.herewith for the granulation of the metal) is placed in the drawers C, which are then pushed into their respective places in the chamberA.

In the drawerli of the generator F is conveyed acetic acid, carbonio-acid gas or material from which carbonio-acid gas maybe evolved, andbelow wliich, in the furnace I, is'. .kindled a charcoal-hre, and whereby the acid in the drawer above is vaporized. The vapor thus generated iills the chamber E, from ,which it 4p assesthrough the pipe G into the gasreceiver or chamber E below the drawers.

Y By means of the force-pump or injector K the vapor is forced from said chamber through the series of drawers or shelves into and among the granulated lead therein, which is immediately attacked by the vapor and 'reduced to a carbonized condition, or oarhonate of lead.

This process occupies vbut from three to tive days, and the result of which is a carbonate of lead equal in purity and iiueuess to `that produced in the old pro# cess, occupying a much longer period of time.

The Vnecessary heat for vaporizing the acetic acid or other material for the production of carbonio-acid gas can be obtained by the use of steam.

The gas, however, from the burning charcoal-assists in the carbonizi'ng process, and therefore cau beV used with better results than .can be obtainedby the use of `steam for vaporizing the acids.

Claims.

What I claim as mvinvention, and desire to secure 1. The generator F, drawer H, and furnace or fireplace I, in combination withfthe chamber A, vaporchamber E, and drawers U, arranged and operating in relation t0 each otheras and for the purpose substantially as ,set forth.

2. The pump K, pipe I', and chamber' E, in combination with thevchamber A` and drawers O, arranged and operating as and for the-purpose substantially specitied.

' THOMASA H. BURRIDGE.

Witnesses:

' C F. LEAviTfr, Lions* Dncicnn. 

